Canon 5D Mark III Light Leak?

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#81
dilbert said:
Does the light leak when the mirror is up or just when it is down?
Click to expand...

I tested with the mirror up shining a 3 D-Cell maglight at the LCD at point blank range, and get no appreciable difference between two 1s exposures at ISO 25,600. So I'm confident in saying that no, the light leak, at least on my 5D-3, doesn't seem to reach the sensor.

For that matter, with a lens on the camera even in a dark room (metering <1/4, f/4, ISO 6400 / or <EV0) I can't get the backlight to alter the exposure in any appreciable way. (I.e if it's teetering on the edge between 1/4 and 1/5, it does so regardless of the backlight state.) For that matter, I see more fluctuation in the meter due to subtle camera movements changing the framing and the orientation/positioning of my eye to the viewfinder than there is from turning the LCD backlight on/off in these tests. Likewise, shooting into the dark from under a light and shading the LCD is making no discernible changes to the meter for me.

I should note my 5D-3 fails the test as given in the article. Likewise, the shine a light on the LCD test, not only does my 5D-3 fail, but so does my 1D-3 and I've never had an exposure/meter issue with that in the 2+ years I've had and used that body. Moreover, they seem to meter near identically for the same scene, lighting and framing, at least within my ability to control for errors.
 
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#87
My 50D has this "problem" whereas my 5D classic does not.
Seems there must be some real Canon Haters out there that are going to all lengths to pick the 5Diii too pieces, who else would have dreamed up a test like this ???
 
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#90
Here are my observations: with the body cap on, I get shifts in exposure based on LCD backlight, or shining a bright light into the LCD.

With the Canon 50mm f/1.4 on, lens cap off, in place of the body cap, in the dim room I'm currently in, I can't make it change unless I shine a light into the viewfinder - no angle or brightness into the LCD makes any difference whatsoever.

To me, it looks like the leak is so small it has no impact unless the sensor is receiving no other light at all.

I can't even get a picture of the leak with ISO 25600, 30 seconds, and shining a bright light on the LCD (or using the backlight).
 
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#91
Probably it depends on what lens cap has been used! I searched the net and there seems no information on what lens caps are used most by photographers.. ::)

So please before you (i mean everybody) publish your test results, let us know the brand of the lens cap used, how old is it?..etc. Try using multiple lens caps and record your results (if possible)
 
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#93
Hesham said:
Probably it depends on what lens cap has been used! I searched the net and there seems no information on what lens caps are used most by photographers.. ::)

So please before you (i mean everybody) publish your test results, let us know the brand of the lens cap used, how old is it?..etc. Try using multiple lens caps and record your results (if possible)
Click to expand...

If you're referring to the body cap, my tests don't care about that, I also wrapped the camera up in a T-shirt I had handy to further block out light from all external sources (I also had the VF blocked once I figured out that it made a difference)

Though FTR it was the official Canon cap, brand new that came with the camera :)
 
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#95
I have also tried it with a lens (24-70 L) with lenscap on. And it was the same, also for av mode. And it was also when I pointed a flashlight on the upper lcd, while the rest was covered to be not influeced by the light...also the viewfinder was covered all the time!

I could only registrate that issue between exposuretimes of 1/13 and a few seconds (up to 10" or so)

cheers rob
 
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#96
Hi all

First post here.

Tried that in my 7D and no problem there. I was courious as i'm interested in the MarkIII and can't believe a 3500USD camera has this problem. In my point of view is not acceptable. For example, that would have ruined some of my long exposure pics (ex Auroras) and I don't understand how so many people call this a non-issue. For a 500USD camera maybe but for a 3500USD one...?

On my side I guess I'll wait a bit more then before commiting to the MarkIII.

br
 
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#97
indeed no problem on a 7d
could it be that they switched the amber backlight position from the right(7d) to the left next to the mirorbox?

when you look at the lcd at an angle you can make out the led.
i believe that one side of the lcd is mirrored off to reflect the backlight back.
the ledside isn't so sunlight can sliptrough and the ledlight itself will have a more profound effect when placed next to the mirror box

can someone check the position of the backlight led on the markIII?
 
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#98
altenae said:
xaviesta68 said:
Mine is experiencing the same issue, too :(
Made me worry for a while :p
Then, I tested my D3s... the same issue showed up!!
Am I doomed or it's just a negletible issue? :D
Click to expand...

And the Nikon D300 also.
Terrible now I can't take any good pictures with the lenscap on !!!!!
Click to expand...

Well, fortunately now people have something to blame underexposures on. I too was concerned at first, until I did a lot of testing in/out of shade while changing the variables (the biggest of which seems to be the viewfinder in my testing with a tripod, pointed at the same scene, and covering/uncovering various parts of the 5d3).

Frankly I find this all ridiculous. Exponentially more light leaks in through the viewfinder, even with your eye up to it. I get no change in exposure with lens cap off and the viewfinder completely covered, and allowing sunlight directly on the LCD vs. in shade. However, if I uncover the VF, I see tiny changes - as with every other camera I've ever used.
 
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#99
fegari said:
Hi all

First post here.

Tried that in my 7D and no problem there. I was courious as i'm interested in the MarkIII and can't believe a 3500USD camera has this problem. In my point of view is not acceptable. For example, that would have ruined some of my long exposure pics (ex Auroras) and I don't understand how so many people call this a non-issue. For a 500USD camera maybe but for a 3500USD one...?

On my side I guess I'll wait a bit more then before commiting to the MarkIII.

br
Click to expand...

Do you take pictures with the lenscap on or off ??????????
 
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#100
altenae said:
fegari said:
Hi all

First post here.

Tried that in my 7D and no problem there. I was courious as i'm interested in the MarkIII and can't believe a 3500USD camera has this problem. In my point of view is not acceptable. For example, that would have ruined some of my long exposure pics (ex Auroras) and I don't understand how so many people call this a non-issue. For a 500USD camera maybe but for a 3500USD one...?

On my side I guess I'll wait a bit more then before commiting to the MarkIII.

br
Click to expand...

Do you take pictures with the lenscap on or off ??????????
Click to expand...

All these YouTube light issue on the 5D mark iii is with lens cap on !
 
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